AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.
WebTechResources - Find best tech resources everyday, sorted by people like you, ready to select and use.
Ruby Toolbox - Explore and compare open source Ruby libraries
LibHunt - LibHunt tracks mentions of software libraries on relevant social networks. Based on that data, you can find the most popular projects and their alternatives.
Passerine - Refined Product Hunt Desktop Client 🚀
GitSpo - Measure & engage your open-source community